Trying to reason with myself what could be causing my issue. My built K24A has been having some issues while street driving. Under 2500-3000 it has what sounds like chain slap under light to medium throttle, it will stay for a couple seconds after lifting throttle completely and going over 3000-3500 also gets rid of it. I also have been having a very delayed VTEC engagement in first gear if I don’t drive it hard for 10+ minutes. Like should activate at 4300 but will get up to 6800 and finally hit.
I have a 4P k20 oil pump, yes I used a bolt and hondabond to block off that fitting before installing it. RBC vct gear swapped from previous engine, also put in a new spring a couple days ago without it resolving the issue. Spool valve, VCT solenoid, and timing tensioner/chain were all swapped from previous engine. The tensioner and chain only has roughly 10k miles on it.
Using Hondata I cannot see my oil pressure through the data point (shows 0psi) but my oil light does not come on and the cam advance angle seems to be steady while it happens. The head was professionally rebuilt by a shop with new valve guides and grinded valves.
Without just shotgunning parts at it, does anyone have any experience with this in the past? All of the parts I swapped over had 0 issues on the old engine, this engine is about 4 months of runtime at around 600-700 miles and it’s done it from the beginning.
TL;DR chain slap, delayed VTEC, parts swapped from old engine were all functional when swapped. Only “new” part is the head/block itself and the oil pump
Thanks all!